Diamantina’s former lover Andres Mascorro, who was also convicted of Darryl Kolojaco’s murder, has finally agreed to be interviewed in prison — after years of Alex writing to him with no response.

Mascorro insists he is innocent; that police coerced a confession from him and threatened to deport his undocumented family back to Mexico. He tells Alex: “I never knew what one signature could do.”

Presented by Alex Hannaford and produced by Peter Sale