Mark Karasek pleaded guilty to second-degree murder and first-degree unlawful firearm possession on Thursday, according to the King County Prosecuting Attorney’s Office.

Sentencing — with a range of 154 to 254 months in prison — is set for 2:45 p.m. Aug. 25 before judge John Erlick at the King County Courthouse in Seattle.

Karasek, then 23, originally pleaded not guilty to second-degree murder after his father, Zdenek Karasek, was shot and killed on Jan. 9, 2015.

As previously reported, the two had allegedly been arguing all day prior to the incident at their home in unincorporated King County near Redmond. According to the report, several individuals in the Karaseks’ home witnessed the two arguing and heard gunshots, though no one actually saw what had allegedly happened.

Mark was charged with second-degree murder.