LINCOLN, Neb. (AP) — Doctors treating a man found incompetent last year to stand trial for the stabbing death of his son-in-law say the 78-year-old man is unlikely to become competent again.

Police say Bayapa Lingala stabbed 46-year-old Sujay Nooka on Aug. 5, 2014 at a birthday party for Nooka’s daughter.

Doctors treating Lingala this year initially found that he could understand the charges against him after he was given medication for a mental illness. But now, the doctors said Lingala suffers from dementia and significant memory impairment and is no longer competent to stand trial.

The doctors’ latest conclusion could lead to Lingala’s civil commitment or, potentially, his release.

Prosecutors have asked for a delay in Lingala’s upcoming competency to get another opinion.