BALTIMORE (WJZ) — New developments surrounding a brutal attack in North Baltimore. Police have arrested a third teenager who they say confessed to murdering a young man who was biking home from work in Harbor East.

Rick Ritter was at a vigil for the victim and had a chance to speak with his family.

Robert Ponsi, 29, worked at James Joyce Pub. His family says they were supposed to be celebrating his 30th birthday Tuesday, but instead, they’re looking for answers in this senseless killing.

Stabbed and left to die.

“Can’t fathom this kind of action out of boys this age,” said Dawn Ponsi, victim’s mother.

Dawn Ponsi is trying to come to grips with a brutal beatdown that left the 29-year-old dead.

“Was he alone? What was his final moments? Why?” she said.

Saturday night, Robert Ponsi leaves work at James Joyce Pub in Harbor East and bikes home through the Waverly community. There, he’s met by a group of teens.

Ponsi stopped his bicycle in the area of Old York Road and Venable Avenue and some sort of verbal confrontation broke out. Police say that’s when the group assaulted, stabbed and robbed the victim.

Charging documents show the teens yelled “get his [expletive], get his wallet” and that Ponsi tried to get them away by swinging his bike back and forth.

Emergency calls shed light on Ponsi’s struggle just before he died.

RELATED: 2 Teens Arrested In Fatal Stabbing

The three teens arrested and charged are Antwan Eldridge, Daquan Middleton, and now, Prince Green.

Green is the son of a Waverly activist. Police say he confessed to stabbing the victim.

“You’ve ruined your family, as well as mine. It just… It doesn’t make any sense,” said Dawn Ponsi.

Dozens showed up for an emotional vigil Tuesday, mourning the loss of a young man who loved cycling.

“It’s unreal that we’re doing this for his birthday,” said Briana Miles, victim’s sister.

Heartache in a city that can’t take any more violence.

Ponsi’s family says they’re grateful for the arrests, noting that some families never get justice. Three-year-old McKenzie Elliott was shot in that same neighohrood. Her killer was never found.

All three teenagers have been charged as adults with first- and second-degree murder. All three are being held without bond.