An expert says the Missouri man convicted of killing three people at separate Jewish sites in Kansas will live only five to six more years.

Jurors are deciding whether Frazier Glenn Miller should be sentenced to death or life in prison for the April 2014 shootings.

The 74-year-old Miller, an avowed white supremacist, has represented himself at trial. On Friday, he called Dr. James Lineback to the stand. The pulmonologist testified that research suggests Miller, who suffers from emphysema, will live another five to six years.

Miller killed 69-year-old William Corporon and Corporon's 14-year-old grandson, Reat Griffin Underwood, at the Jewish Community Center in Overland Park, then 53-year-old Terri LaManno at the nearby Village Shalom retirement center. None of the victims was Jewish.

Jurors will resume their sentencing deliberations Tuesday.