The suspect in the 1980 cold case rape and murder of a Mobile teen was found guilty Tuesday after his first prosecution ended in a mistrial.

A Mobile County jury convicted Alvin Ray Allen, 65, in the Sept. 11, 1980 rape and killing of 19-year-old Sandra Elaine Williams, Fox 10 reported.

Allen’s conviction was not yet reflected in court records early Tuesday evening.

The jury found Allen guilty after just 30 minutes of deliberations, the outlet reported.

Williams’ body was found on a dead-end street in Toulminville. Investigators said Williams had also been raped.

No suspects emerged at the time of the murder and the case went cold for decades until Williams’ family encouraged state investigators to re-examine the case, using DNA technology not available in 1980, as well as re-interviewing witnesses.

Allen was in and out of police custody numerous times in the decades following the murder on charges including assault, resisting arrest and DUI.

But it wasn’t until Sept. 10, 2019 — almost 39 years to the day after Williams’ murder — that police arrested Allen for the crime. Police arrived at Allen’s Mobile home with a warrant following a grand jury indictment, but he refused to leave his property until a SWAT team arrived and broke down his door.

Court records show Allen was charged with murder and pleaded not guilty to the crime. He was allowed to post bond and be released on condition he wear an electrical monitoring device, have no contact with the victim’s family and only travel to his home, three rental properties he owned and church.

In January 2020, Allen’s attorney filed a motion to end the electronic monitoring component of his release, but the motion was denied by Mobile County Circuit Court Judge Ben Brooks.

In March 2020, Allen went on trial for Williams’ murder, but following a five-day trial and three days of deliberations, the jury foreman advised Brooks the jury could not reach a verdict and declared a mistrial.