He shot April Jace, 40, in the back and then twice in the legs at their family home in May 2014, while the couple's young children were present, reported BBC.
Jace's son, now 10, told the court he heard his father saying, "If you like running then run to heaven," before firing the second time.
Jace will be sentenced on June 10 and could face up to 40 years in prison.
Deputy District Attorney Tannaz Mokayef said during the trial that the 53-year-old actor was upset that his wife wanted a divorce and believed she was having an affair, although no evidence was presented to support this.
The 53-year-old actor played Detective Julien Lowe in police drama "The Shield".
He also had small roles in films such as "Planet of the Apes", "Boogie Nights" and "Forrest Gump".
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