WOBURN, Mass. â€"  The fatal stabbing of a Burlington woman was witnessed by a friend of the woman's teenage daughter who had been video chatting with the girl on an iPad, a prosecutor said Monday.

The details were released in Woburn District Court as Christopher Piantedosi, 39, was arraigned on a murder charge in the death of Kristen Pulisciano, 38.

Assistant District Attorney Nicole Allain said Piantedosi chased Pulisciano into their daughter's bedroom and stabbed her 34 times Thursday. The person the daughter had been video chatting with saw and heard parts of the attack, including Pulisciano pleading, "Chris, please stop, I love you," and Piantedosi saying, "You're going to die," Allain said.

Authorities say the couple had a longstanding relationship but were not living together at the time.

Their teenage daughter called 911.

Allain said Piantedosi had tried to commit suicide in the days before the attack.

Piantedosi was ordered held without bail. He is due back in court June 7 for a probable cause hearing.

Last year, Piantedosi was dubbed the "remorseful robber" after he returned cash and a GPS he had taken from a woman's cart at a grocery store in Plaistow, N.H.