Kevin E. Mattison
Kevin E. Mattison (York City Police)

A man wanted for allegedly shooting a man in the back of the head and stealing his drug stash was captured in Maryland early Thursday morning.

Kevin Edward Mattison, 32, of Baltimore, was found hiding in a third-floor attic of a home in Middle River, Md., around 7 a.m., according to York City Police.

Police tracked Mattison to the home of a woman he was staying with off and on, Detective Al Clarkson said. The woman claims she had no idea Mattison was wanted, he said.

Mattison hid in the attic, causing members of the Baltimore City Fugitive Apprehension Squad and U.S. Marshals to use tear gas to get him out.

Mattison is being held without bail at the Baltimore City Detention Center, pending extradition proceedings to have him returned to Pennsylvania to face homicide, robbery, burglary and criminal conspiracy charges.

Police say that Mattison shot Christian Agosto, 34, of York, in the back of the head inside Agosto's home in the 600 block of West Philadelphia Street on Dec. 9.

After the shooting, Mattison allegedly took a pound of marijuana out of a kitchen cupboard in the home, police said.

Agosto died on Dec. 16 at York Hospital after a week on life support, police said.

Police have also charged Heather A. Johnson, 30, of the 400 block of East Prospect Street, York, in connection with the crime. She is charged with robbery, burglary and conspiracy.

Police say Johnson called Tiffany Kenney, one of Agosto's girlfriend's. Johnson told Kenney that Agosto was with another woman. When Kenney went inside to confront Agosto, Mattison followed the way into the apartment, police said.

Kenney told police she ran from the apartment and met Johnson outside in the hallway, begging her to go inside and "get her boy," referring to Mattison, according to the criminal complaint.

Both women said they heard a gunshot and saw Mattison run out with a large bag of marijuana, according to court records. Mattison, Kenney and Johnson then ran to the SUV and fled, according to police.

Agosto moved to York from New York City and had few local ties, outside of several girlfriends, police said. Lakisha Smith, his girlfriend from New York City, stood by his side at the hospital during the victim's last moments, police said.