A profesor at Indiana University is one of only two people to have ever escaped from the Mexican penitentiary Palacio de Lecumberri!

Dwight Worker was a student at Indiana University turned activist and adventurist after his brother was paralyzed in the Vietnam War in 1964. While trekking through South America, Worker tried cocaine for the first time and continued using once back in the states. In the Fall of 1973 he left for Peru to find cocaine. 

That December, customs officials in the Benito Juarez Airport arrested Worker for trying to smuggle 780 grams of cocaine and got a signed confession after torturing him. He was sent to Palacio de Lecumberri, also known as the Black Palace of Lecumberri. The medieval looking prison was built to house 800 inmates, but at that time it held 4,000. 

There were on average 200 murders within the prison each year. Barbara Chilcoate went to visit Worker in prison in 1975 and moved to Mexico City to be close to him. They were married in the prison on December 17, 1975. Two hours after the ceremony, Worker escaped from prison, making him the second and last person to ever escape from Palacio de Lecumberri. 

The first person to escape was Pancho Villa. During his two years there, Worker was hospitalized 3 times for beatings, 4 stab wounds, and a 17 day hunger strike. He later became a professor at Indiana University and continues to be a Mexican fugitive. 

(Source)