Matthew Daddario & Isaiah Mustafa Join ABC Family's SHADOWHUNTERS

ABC Family continues to add to the "Shadowhunters" crew with the casting of Matthew Daddario ("Delivery Man") as 'Alec Lightwood' and Isaiah Mustafa ("Horrible Bosses") as 'Luke Garroway.' It was announced today by the network.

Based on the bestselling young adult fantasy book series The Mortal Instruments by Cassandra Clare, "Shadowhunters" follows 18-year-old Clary Fray, who finds out on her birthday that she is not who she thinks she is but rather comes from a long line of Shadowhunters - human-angel hybrids who hunt down demons. When her mother Jocelyn is kidnapped, Clary is thrown into the world of demon hunting with mysterious Shadowhunter Jace and her best friend, Simon. Now living among faeries, warlocks, vampires and werewolves, Clary begins a journey of self-discovery as she learns more about her past and what her future may hold.

Alec Lightwood joins Jace and his sister, Isabelle, in their pursuit of demonic creatures. He's tortured by his romantic love for Jace, who is his adoptive brother and fighting partner. The eldest of the group, his strict moral code forces him to follow the law to the letter.

Luke Garroway is an NYPD detective investigating a string of "demonic" murders. Luke feels a fatherly instinct to protect Clary, a strong affection for Jocelyn and has secrets of his own. Once a strong and powerful Shadowhunter, he has since become the thing he once hated most - a werewolf pack leader.

"Shadowhunters" is produced by Constantin Film and executive produced by Ed Decter and McG. McG will also direct the first episode. The network has previously announced Katherine McNamara as 'Clary Fray,' Dominic Sherwood for the role of 'Jace Wayland,' Alberto Rosende as 'Simon' and Emeraude Toubia as 'Isabelle Lightwood.'