36-year-old Daniel Galvin was shot in the head on Sunday, according to Erie police.

East Erie resident Denise Galvin, during an interview with Erie Bureau of Police detectives, told them she was present when her boyfriend, Joseph John DiGello, fatally shot her 36-year-old son Sunday night inside her home.

A short time later, when the first officers arrived at the house, DiGello, 61, was using the bathroom. He had blood on his bare feet, which police photographed, and police said they heard DiGello say “Who did I just shoot?”

Those are among the details in the probable cause affidavit of DiGello’s arrest warrant. He was charged on Monday afternoon in relation to the shooting death of 36-year-old Daniel Galvin.

The affidavit states that Denise Galvin identified the victim as her son.

Erie police on Monday afternoon filed a single charge of criminal homicide against DiGello, as well as two counts of aggravated assault and single counts of reckless endangerment and possessing an instrument of crime, Deputy Chief Mike Nolan said.

DiGello was arraigned on the charges Monday and is being held without bond, authorities said.

The arrest warrant does not mention a motive for the shooting, but the probable cause affidavit contains other details.

DiGello lived at 3824 Tuttle Ave. with Denise Galvin. Daniel Galvin did not live there, authorities said.

Denise Galvin referred to DiGello as her boyfriend in her conversations with police.

Officers were dispatched to the Tuttle Avenue home about 8:26 p.m. to investigate a report of a hysterical female who had called 911.

When officers arrived at the tan brick ranch-style house, they found Daniel Galvin dead inside, the affidavit states. He had suffered a gunshot wound to the head.

Daniel Galvin “was located inside the front door of the residence in an area connecting the living room to a dining area,” according to the affidavit. Officers also saw a small-caliber handgun on a recliner chair not far from Daniel Galvin’s body, according to police.

When police found DiGello in the bathroom, he “made spontaneous utterances to patrol officers,” including “Who did I just shoot?“ the affidavit states.

Police also allege in the affidavit that detectives reviewed the 911 call Denise Galvin made to police on Sunday night, and she can be heard saying “He killed my son” to a dispatcher.

“When asked who, she states ’Joe DiGello,”’ the affidavit states.

During her interview with detectives after the shooting, according to the affidavit, Denise Galvin stated that at the time of the shooting “she, Daniel and Joe DiGello were inside 3824 Tuttle. She and her son remained in the living room/dining room area as DiGello entered the bedroom area.

“Denise stated that she observed DiGello return to this area of the home,” according to the affidavit. “She observed DiGello raise his arm in a manner similar to a person raising a firearm and point that arm in the direction of her son. She then heard a loud noise. She then observed her son (lying) on the floor and a large amount of blood began to pool.”

Erie County Chief Deputy Coroner Nick Rekitt pronounced Daniel Galvin dead at the scene at 9:25 p.m.

Police continue to investigate.

Contact Tim Hahn at thahn@timesnews.com. Follow him on Twitter @ETNhahn.

Contact Kevin Flowers at kflowers@timesnews.com. Follow him on Twitter at @ETNflowers.