hawkins slugged ramos in the mouth and sammy johnson who tackled him in the ground. moeth men you can see there sat on ramos until a bart officer arrested him. this is not his first run in with police. he was convicted of a sexual attack on a 7-year-old girl in hayward in '03, paroled in '06 and a discharge in '09. he went on the megan's law website and he is listed, but they only say he lives in union city. his exact address was not subject to disclosure. live here in fremont, bob redell today in the bay. >> a big question is how can a registered sex offender go unmonitored? we will tell you why it's difficult to keep taps on the predators. >> the parents of a toddler killed on his second birthday of in jail on endangerment charges. they were in the pormt complex with his 4-year-old big brother when a gun went off. the boy's paternal grandmother was in the living room at the time. they are looking into how the gun got into the children's hands. the boy's parents eddie carr came home a short time later. they were supposed to have a big birthday party for the toddler

. >> reporter: that's when 55- year-old sammy johnson stepped in. >> at that point i looked at the baby and the lady standing there asking me to help. so i just tackled the guy and sat on him and called 911. >> reporter: b.a.r.t officer corey frost was flagged down and made the arrest. he declined an on camera interview but issued a written statement saying a lot of ns the death of a todd suspect is now in jail. >> thanks goodness for the good samaritans. kiet do, thank you very much. >>> it was his second birthday but tonight an east bay family mourns death of a toddler shot to death inside their home. the shooting happened at 11:30 a.m. this morning inside an apartment on lemon tree court in antioch. joe vazquez on why it is still unclear exactly what happened. joe? >> reporter: dana, we are talking about two very young boys. a 4-year-old and 2-year-old. they were playing in the parents' bedroom. they are not sure who shot the fatal shot. friends and family are remembering the child. a small memorial is growing where the 2-year-old was killed with his parents' handguns. his mom had ju

. >> reporter: also seeing the commotion, shopper sammy johnson came in right after hawkins. >> finally caught him. he tried to fight. he gave up his stance so i gave up the stance also. swung at him. i popped him in the cheek. he swung back, he missed. >> i looked at the baby and the ladies standing there asking me to help. so i just tackled the guy and sat on him and called 911. >> reporter: a bart officer who happened to be nearby actually ended up arresting this suspect. he's being held tonight on a $350,000 cash bail. we've also learned tonight that the suspect had been convicted of sexually assaulting a 7-year-old girl in hayward back in 2003. elise kirschner, nbc bay area news. >>> now for a developing story in the east bay. tragedy in the east bay. a 2-year-old boy is dead tonight after he was shot inside an apartment in antioch this morning. the child's parents are now charged with murder. police just wrapped up a briefing on that incident. damian trujillo is here with the very latest. >> reporter: as you mentioned, police have arrested the boy's parents and charged them with m

. >> and that's when 55-year-old sammy johnson stepped in. >> at that point i looked at the baby and the lady standing there asking me to help so i just tackled the guy and sat on him and called 911. >> b.a.r.t. officer cory sparks was flagged down and made the arrest. he declined an interview and says a lot of people are saying i did a good job and i appreciate that but the citizens are the heroes, not me. >> the community police gave hawkins an award saying he would have gotten away without their help. they stepped in just because they were asked to. >> i was glad to be a part of this take-down really. it was a blessing for me to be there. >> and ramos is now at the santa rita jail in dublin charged with rape and kidnapping and back in 2003 he was convicted of sexually assaulting a 7-year-old in hayward. dana? thank goodness for the good samaritans. kit, thank you very much. >>> well, today he turned 2, and tonight his family is mourning his death. the boy shot in the head this morning inside an apartment in antioch. joe vasquez on why it is still unclear exactly what happened. >>

. >> reporter: sammy johnson helped hawkins pin down ramos until police arrived. >> i just talked to him and sat on him. and dialed 911. >> reporter: police arrested ramos for sexual assault, forcible rape and kidnapping. johnson and hawkins were recognized today in city council. >> i've never seen something to heinous, this is as bad as it gets. >> reporter: ramos confessed to assaulting the girl in the store. >> that little girl is destroyed for the rest of her life. not only that but her mother will have to explain to her what happened to her in the long run. that's just devastating. >> reporter: police know that there are other people who witnessed this crime and they want those people to come forward and to call them. coming up at 6:00, you will hear more from those good samaritans as to what made them chase that man out of the store, reporting live from union city. janine de la vega. >>> now from janine we go to robert handa. he talked today with the mother of the suspect. robert-- >> reporter: frank, the suspect in this case is a familiar person to the people here at the union

one slugged him in the mouth and sammy johnson who tackled him to the ground. both men seen at a news conference sat on him until a bart officer who happened to be in the area arrested him. this is not his first run in with police. he was convicted of a sexual attack on a 7-year-old girl in hayward back in 2003. he was paroled in '06 and discharged with the system in '09. we checked the megan's law website and he is listed on the website assive living in union city, but his specific address was not subject to disclosure. live in fremont, today in the bay. >> we had special reports all this week concerning how convicted sex offenders are monitored and how many of them often disappear from the radar. eugene ramos was discharged from the system in 2009 after serving time. he was charged and convicted of a sexual attack on a 7-year-old girl in 2003. ramos is a registered sex offender in the megan's law website but with no address. there many problems with the monitoring system. >> we had younger and younger people who don't understand the extent of the planning and