A suspect in last week’s fatal subway slashing incident is now facing murder charges.

Alvin Charles, 43, is believed to be responsible for slashing Tommy Bailey during an argument that authorities say turned violent on the L train last Friday.

According to police, the dispute began when Bailey, 43, told Charles to stop verbally disrespecting NYPD officers patrolling near the mezzanine level of the Atlantic Avenue subway station. Charles then allegedly slashed the 43-year-old Brooklyn native in the neck.

Bailey was later pronounced dead at Brookdale Hospital.

His family says he was a steamfitter. Bill Abbate, a member of the local steamfitter union, was shocked by Bailey’s death.

"Everybody's been calling me and reminiscing about how great of a guy Tommy was and how it's so sad. It's unfathomable. People are just numb. No one would expect something like this to happen,” he said.

If convicted, Charles could spend up to 25 years in prison.