Travis County Jail records show 42-year-old Peter Levay of Austin was held Tuesday on a murder charge.
Bond has been set at $200,000 for Levay, who was arrested Monday. Online jail records did not list an attorney for him.
Authorities are trying to determine a motive for the killing.
An affidavit says the body of a 63-year-old man was found Sunday by police after Levay returned home and mentioned an altercation to his roommate. Police Tuesday did not immediately release the name of the victim.
Police say the death appears to have been caused by blunt trauma to the head and the weapon allegedly was a guitar.