Months of death threats by his first-born son ended Sunday with Barnesville lawyer Gary D. Marchalk lying dead in a pool of blood, a baseball bat at his feet.

The son, Michael D. Marchalk, 37, fled in his parents' car. He failed to show up Monday at a drug treatment program as planned, and was last determined to have been at a Greyhound bus terminal in Philadelphia.

State police at Frackville have charged him with criminal homicide, murder of the first degree, murder of the second degree, murder of the third degree, voluntary manslaughter, aggravated assault, robbery, theft, theft of a motor vehicle, access device fraud, and recklessly endangering another person.

Here's how the situation unfolded, according to an affidavit of probable cause filed by Trooper Joseph W. Hall with District Judge Christina E. Hale of Frackville.

Gary Marchalk's younger son, Matthew D. Marchalk, 33, called Schuylkill County 911 at 11:47 a.m. Monday, saying his father appeared to be dead.

State police rushed to the house, at 21 Pear St., where they found Marchalk's battered body in an upstairs bedroom, lying face down, the walls, ceiling, and door spattered with blood, and the bloody bat at his feet.

His wallet was gone, as was his gold 2015 Ford Fusion.

"My brother did this. I know it," Matthew Marchalk told police.

He said his brother has a drug problem, including heroin addiction, and had been using recently.

Michael had been making threats to kill Gary Marchalk and the family, Matthew Marchalk said.

Police spoke with Gary Marchalk's wife, Schuylkill County Treasurer Linda Marchalk, who told them she had moved out of the home several weeks ago. Gary Marchalk had filed for divorce on May 11. The couple wed in 2007; Matthew and Michael were born to Gary and his first wife, the late Mary Ann Marchalk.

Linda Marchalk told police Michael has for years had a drug problem, and had moved in with his father the week before.

As of Wednesday night, police have not located Michael Marchalk.

For updates on this story see Thursday's editions of the Times News.