OMAHA, Neb. (AP) — An effort to have DNA results admitted into evidence in the case against a former doctor accused of killing four people with ties to an Omaha medical school could delay his trial.

Douglas County Attorney Don Kleine has asked the Nebraska Supreme Court to delay the first-degree murder trial of Anthony Garcia, which is set to begin next Monday. Kleine also asked the high court on Monday to vacate District Judge Gary Randall’s decision excluding advanced DNA analysis from trial.

Garcia is charged in the March 2008 slayings of Dr. William Hunter’s 11-year-old son and the family’s housekeeper, as well as the May 2013 killings of Dr. Roger Brumback and his wife. Prosecutors say Garcia was seeking revenge over being fired from a Creighton University School of Medicine residency program.