Mark Karasek’s trial was moved from March 28 to Sept. 18, according to the King County Prosecuting Attorney’s Office.

Karasek, then 23, who 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.