. >> joan davies knew dunkel well. he was a family friend who hung out with her boys. she drove to the state prison at jamestown. by this point her son, also named john had been missing almost four years. >> i knew the minute i walked in and i looked at him. that he had murdered john. after they left me alone with him, he started to tear up. when i kept saying over and over again, john, we need to know. >> dunkel did not crack at jamestown but those familiar with the case told me joan davies set the stage. when he began serving a sentence he started a sexual wrip a cell mate charles rice and told him about killing the boys. rice turned dunkel in to authorities. hoping to get a deal on his own manslaughter charges. >> detectives thought dunkel would be moretalkative there. the two joked about dunkel return together scenef the davies murder and findg wild animals. dunkel told detectives he went to the dave yeez house after 2:00 in the morning convinced the fwoi drink beer with him, then stabbed him in the back with a pairing knife. >> he said get the stick out of his bac

but those familiar with the case say joan davies set the stage. when he started serving his sentence in san luis abyss spoa he started a sexual relationship with a cell mate, charles rice, and told him about killing the boys. rice turned dunkel into authorities hoping to get a deal on his own manslaughter charges. detectives thought dunkel would be more talk tiff with his cell mate there. the two joked about dunkel return together scene of the davies murder after and finding wild animals. >> dunkel told detectives that he went to the davies house after 2:00 in the morning and convinced the boy to drink beer at edgewood park and then stabbed him in the back with a pairing knife. >> get the stick out of his back. >> dunkel said he stabbed davies in the throat and dropped the knife. so he finished him off with a 12-inch round rock. >> his cell mate couldn't find any remains, but the map dunkel drew lead a search team straight to the spot along highway 280. >> this is the first bone we have found in the time of trochesly 1:20 -- approximately 1:20. th

but those familiar with the case say joan davies set the stage. when he started serving his sentence in san luis abyss spoa he started a sexual relationship with a cell mate, charles rice, and told him about killing the boys. rice turned dunkel into authorities hoping to get a deal on his own manslaughter charges. detectives thought dunkel would be more talk tiff with his cell mate there. the two joked about dunkel return together scene of the davies murder after and finding wild animals. >> dunkel told detectives that he went to the davies house after 2:00 in the morning and convinced the boy to drink beer at edgewood park and then stabbed him in the back with a pairing knife. >> get the stick out of his back. >> dunkel said he stabbed davies in the throat and dropped the knife. so he finished him off with a 12-inch round rock. >> his cell mate couldn't find any remains, but the map dunkel drew lead a search team straight to the spot along highway 280. >> this is the first bone we have found in the time of trochesly 1:20 -- approximately 1:20. th

>>reporter: ever since their son went missing in 1981 jim and joan davis suspected john doug el was a family friend. >> he was in and out of our house every day. he knew where the key was. he called us mom and dad. >>reporter: after their son disappeared doug el never returned to their house and that raised suspicion. so jim cave is began tracking doug el. after kevin collins disappeared in san francisco he confirmed doug el traveled from the home in belmont to the cit city. the night kevin went missing. >> i determined that he was in san francisco not directly from john but from all of his friends. >>reporter: and belmont police confirmed doug el movements that day. >> john may involved in from my understanding the that they may have placed him in san francisco around the time the collins went missing. >>reporter: davis tells me he tried to report that information to san francisco police who were heading the kevin collins investigation. >> they didn't want to hear what i had to say. it was that simple. >> oh, yes san francisco police comment on davis account and give me access to the

>>reporter: ever since their son went missing in 1981 jim and joan davis suspected john doug el was a family friend. >> he was in and out of our house every day. he knew where the key was. he called us mom and dad. >>reporter: after their son disappeared doug el never returned to their house and that raised suspicion. so jim cave is began tracking doug el. after kevin collins disappeared in san francisco he confirmed doug el traveled from the home in belmont to the cit city. the night kevin went missing. >> i determined that he was in san francisco not directly from john but from all of his friends. >>reporter: and belmont police confirmed doug el movements that day. >> john may involved in from my understanding the that they may have placed him in san francisco around the time the collins went missing. >>reporter: davis tells me he tried to report that information to san francisco police who were heading the kevin collins investigation. >> they didn't want to hear what i had to say. it was that simple. >> oh, yes san francisco police comment on davis account and give me access to the

>>reporter: ever since their son went missing in 1981 jim and joan davis suspected john doug el was a family friend. >> he was in and out of our house every day. he knew where the he called us mom and dad. >>reporter: after their son disappeared doug el never returned to their house and that raised suspicion. so jim cave is began tracking doug el. after kevin collins disappeared in san francisco he confirmed doug el traveled from the home in belmont to the cit city. the night kevin went missing. >> i determined that he was in san francisco not directly from john but from all of his friends. >>reporter: and belmont police confirmed doug el movements that day. >> john may involved in from my understanding the that they may have placed him in san francisco around the time the collins went missing. >>reporter: davis tells me he tried to report that information to san francisco police who were heading the kevin collins investigation. >> they didn't want to hear what i had to say. it was that simple. >> oh, yes san francisco police comment on davis account and give mellins to the collins fi

. >> ever since their son went missing jim and joan davie expected dunkel who was a family friend. >> he was in and out of our house every day. he knew where the key was. he called his mom and dad. >> after their son disappeared dunkel never returned to their house. so jim davies began tracking dunkel. after kevin collin ss disappeared davies was able to confirm dunkel traveled from his home to the city. the night kevin went missing. >> i determined he was in san francisco not directly from john but from all of his friends. >> belmont police confirmed dunkel's movements that day. >> dunkel may be involved in, from my understanding they may have placed him in san francisco around the time collins boy went missing. >> davies tells me he tried to report that information to police who were heading the kevin collins investigation. >> they didn't want to hear what i had to say. it was that simple. >> oh, yeah. san francisco police to comment on jim davie as kt and give me access to the files but they refused saying it's an open investigation. but they couldn't tell me how long it's been sin

. >> he did not crack at jamestown but those familiar with the case tell me that joan davies set the stage. when he begin serving his burglary sentence at men's colony he started a sexual relationship with a cellmate charles rice and told him about killing the boys. rice turned him into authorities hoping to get a deal on his own manslaughter charges. >> detectives thought he would be more talkative with his cellmate there. they joked about returning to the scene of davies murder and finding wild animals. >> he told detectives he went to the davies house after in the morning convinced him to drink beer with him and stabbed him in the back with a pairing knife. >> he said he also stabbed davies in the threat but dropped the knife. so he finished him off with a 12-inch round rock. his cellmate couldn't find any remains but the map led a search team straight to the spot along highway 280. >> first stone that was found. >> and the undercover officer was there helping wrap up the case. >> pointing to skull. >> lance turner's body was found in the woods in belmont hours after his soccer pr