‘Sirens’ Star Michael Mosley Options True Life Murder Mystery Tale ‘Brother’s Blood’ (Exclusive)

Scott Cawelti’s nonfiction book follows Jerry Mark, a lawyer who murdered four members of his family

“Sirens” star Michael Mosley has optioned the big screen rights to Scott Cawelti’s nonfiction book “Brother’s Blood” and will star as convicted killer Jerry Mark in the true life murder mystery, TheWrap has learned.

Mark was a Peace Corps volunteer and lawyer, who in 1975 was convicted of murdering his brother, sister-in-law, niece and nephew in Cedar Falls, Iowa. The story will feature Mark’s cross-country motorcycle ride from California to Iowa to commit the murders, the landmark investigation, the trial, and his appeals that continued for three decades.

The script is being written by Cal Robertson, and the film will be produced by German Fernandez-Moreno and Jo Henriquez.

“I was born and raised in Cedar Falls, so this story was one that I grew up hearing about,” said Mosley. “I was raised in the same small town as Jerry Mark, we went to the same high school, we were both student body president. He and I could have been friends, if I had been born several decades prior. However, his transition from being a seemingly successful young man to becoming a cold-blooded killer is a character study that I had to take on. This book is the kind of campfire story that would be unbelievable if it weren’t true.”

Mosley currently stars on USA’s “Sirens,” which wrapped up its second season on Apr. 14. He’ll soon be seen opposite Reese Witherspoon and Sofia Vergara in the comedy “Hot Pursuit,” and he also has experience playing psychopaths, having played serial killer Jerry Tyson on ABC’s “Castle.” He’s represented by the Gersh Agency.