Convicted collar bomber Marjorie Diehl-Armstrong died Tuesday morning in federal prison in Texas at the age of 68.

The Federal Bureau of Prisons notified the U.S. Attorney's Office in Pittsburgh of Diehl-Armstrong's death.

Diehl-Armstrong was serving life plus 30 years.

She had been suffering from Cancer.

She was convicted in 2010 for helping to plan and execute a botched collar bomb bank robbery that killed pizza delivery man Brian Wells in August 2003.

Diehl-Armstrong was part of a small group of people who developed a bizarre scheme to place a live collar bomb around the neck of pizza delivery man, Brian Wells, to force him to rob the upper Peach St branch of PNC Bank.

Wells was to have driven to a number of spots after the robbery but he was stopped by police in the parking lot of Eye Glass World.

He died when the bomb detonated before bomb disposal units could arrive.

Diehl-Armstrong also pleaded guilty but mentally ill, to killing her boyfriend James Rhoden, who authorities say threatened to reveal her involvement in the collar bombing.

Rhoden was shot; his body found in a freezer.

Years earlier in 1984, she was acquitted of killing another boyfriend, Robert Thomas. The jury believed her argument, that she shot him in self defense.