Crazed killer JARED LOUGHNER expected to plead guilty in slay spree that left 6 dead, 13 injured including Congresswoman GABRIELLE GIFFORDS.

Insiders say a court-appointed psychiatrist treating Loughner will vouch for his mental competency to make the plea, which the judge must find "knowing and voluntary" after his January 8, 2011 shooting spree in Tucson, Arizona, reported.

Loughner's guilty plea assures a life sentence without parole; if chooses a trial, he could face the death penalty if convicted.

Mavy Stoddard, who lost her husband and was shot three times in the attack, said she hopes Loughner is "either put in a mental institution or life in prison with no parole. "Either one of them," she said. "If he can get some help, that's what he needs. And maybe he will find the Lord … I don't really want the death penalty.

Loughner had previously plead not guilty to 49 federal charges in connection with the massacre.

The six people who died were U.S. District Judge John Roll, 63; 9/11 baby Christina Taylor Green, 9; Giffords aide Gabe Zimmerman, 30; Dorothy Morris, 76; Dorwin Stoddard, 76; and Phyllis Schneck, 79.