Sebastian Olmeda
Sebastian Olmeda

Jurors heard more testimony Tuesday against a York City man known as "Boom" who is accused of firing through a closed screen door and killing a New York man for no apparent reason.

Sebastian Enrique Olmeda, 23, of the 900 block of East Market Street, is charged with first-degree murder and related offenses for the death of 33-year-old Eddie Rivera.

York City detectives allege Olmeda shot Rivera in the chest while Rivera was inside 117 Pattison St. about 2:45 a.m. July 2, 2011, and that Olmeda was standing on the back stoop, directly in front of the screen door, when he fired.

The motive remains unknown, according to chief deputy prosecutor Tim Barker.

"Why this escalated to a shooting? There's nothing that a reasonable mind could draw from it," he said. "It's about as senseless a killing as you can (find)."

Argument: Barker said it appears the shooting was related to an argument in a nearby parking lot that apparently didn't involve either man, but did involve Rivera's girlfriend's aunt, Lydia Rivera-Ortiz.

Defense attorney George N. Marros said his client maintains he fired in self-defense.

During testimony from York City Detective Kyle Hower, Marros repeatedly tried to get Hower to agree it's possible the screen door wasn't completely closed -- that a knife-wielding Rivera was opening it to come outside.

But Hower said the bullet hole in the screen is consistent with the screen door being closed, and with the shooter standing on the stoop in front of it.

Second incident: Also testifying Tuesday was Dustin Sconfienza, who was in the area shortly after the homicide.

Sconfienza said he witnessed a man pistol-whipping a woman at the corner of East Market and Franklin streets about 3:15 a.m.

"I asked him what he was doing," the witness recalled. "He pointed the gun in my direction -- not at me, but in my direction -- and fired twice."

Sconfienza wasn't hurt. He said the gunman then took off and jumped over a fence, his gun discharging again as he landed. That bullet struck a parked car.

Police have said the gunman was Olmeda, and that he was arrested by officers after he jumped the fence.

Testimony is expected to resume Wednesday morning.

-- Reach Liz Evans Scolforo at