veterinary assistant maegan tapley tell abc news she met 25 year old prolific youtube body builder eric stelzer the dating app. >> what's up guys? erich stelzer here! >> reporter: the two ending up in stelzer's home where he allegedly began stabbing tapley in the face with a knife. her mother saying she tried desperately to escape through a door and a window. neighbors hearing screams, calling 911. officers forcing their way inside the bedroom where stelzer reportedly claimed he was god lice using sn ns on . stelzer four times to try im subdue h. the 6'7" body builder unresponsive soon after. he died at the hospital. his father now demanding answers. >> he's my son. i want to find out what happened. >> reporter: tapley seriously injured, possibly losing an eye. the police chief commending officers for saving her life. >> no word on what led to the violent encounter. the three officers are on administrative leave pending the outcome of the d.a.'s investigation. we have reached out to tinder for comment, so far, no comment. >> thank you. >>> when we come back, the urgent warning from a major amer

her daughter met 25-year-old eric stelzer on tender. he called police and emts on christmas. emts said he didn't need assistance because he was lucid enough on his own. his family says they hired a team to bring help bring him to a facility for treatment but then the attack occurred. police used stun guns on the man but he became unresponsive while being taken to the hospital. >> he's my son. i want to know what happened. >> the victim megan tapely suffered extensive injuries but expected to survive. >>> some san francisco people literally rang in the new year today. abc 7 news was inside san francisco's art museum today. people took turns ringing a japanese bell that dates back to the 1500s. this marks the 33rd year for the bell. >>> that billboard in san jose promoting the national championship has a new look tonight. workers swapped out the background to reflect the alabama and clemson will play in the game at levi stadium on january 7th. four super fans had been living on the billboard but after oklahoma and notre dame lost, there are two fans left. nancy and ellis ross w