Police say a "violent encounter" in the basement of his home led to the death of that Notre Dame alum, Patrick Mikes Sr. Now, his 21-year-old son is being charged with open murder.

Patrick Mikes Jr. is expected in court in Troy, Michigan, about 20 minutes north of Detroit, on Thursday afternoon.

WSBT has confirmed through the University of Notre Dame that the 21-year-old senior psychology and pre-med double major is no longer a student there and hasn't been since August 2.

Police in Michigan arrested Patrick Mikes Jr. at a restaurant Wednesday night on the murder charge, saying DNA blood analysis evidence from the basement of the family's home puts his blood with his father's, indicating a struggle between the two men. 

A judge ruled Thursday the younger Mikes will not be able to bond out of jail on the murder charge. 

WXYZ- TV in Detroit is reporting Patrick Mikes Sr. died from blunt force trauma but says police are not releasing details about the weapon.

The 1979 Notre Dame alum has not been seen since Thursday July 26, and police have not found his body. Investigators say they believe the 55-year-old was killed in his basement in Troy.

His sons told police he left on his bicycle July 27, but they didn't report him missing until two days later.

Last week, Patrick Mikes Jr. was charged with using credit cards that belonged to his 16-year-old brother. Oakland County’s chief assistant prosecutor explained why that younger brother hasn't been arrested.

“For a prosecutor to initiate charges, we have to have probable cause to believe they have committed some type of criminal act, and we’ve got to outline what kind of criminal act it is,” said Paul Walton. We have no reason to believe that he is involved in this murder.”

The assistant chief prosecuting attorney told WSBT when Patrick Junior is arraigned Thursday afternoon, the prosecution will ask the judge not to set a bond. If that happens, he would have to stay in jail.

Officials started searching for the body last week, reportedly in a location where Patrick Mikes Jr’s cell phone pinged around the time his father disappeared.  Police told reporters Thursday they're focusing on a three hour time period from July 28 where they aren't sure what Mikes, Jr. was doing.  Farmers in the area also noticed an Infiniti, the same car Mikes, Jr. drives, on a road near their fields that is normally used by farm equipment. 

The search started back up again Thursday, extending into northwestern Genessee and southern Saginaw County. Nearly 50 police officers and several K-9s are combing through woods, streams and fields.