Los Angeles, Jun 5 (IANS): Supernatural drama series "Shadowhunters" will end with a special two-hour final at the close of the upcoming second half of season three.

The cancelled series was loosely based on the popular book series "The Mortal Instruments" written by Cassandra Clare.

"We are very proud of ‘Shadowhunters', a series that broke new ground in the genre world and became a fan favourite," the Freeform network said in a statement to variety.com.

"However, along with our partners at Constantin (production house), we reached the very difficult decision not to renew the show for a fourth season. But as big supporters and fans ourselves, Freeform insisted on and championed the filming of a special two-part finale that would give devoted fans a proper ending.

"The 12 episodes will air in spring of 2019. We want to thank our talented creators, producers, cast and crew along with our colleagues at Constantin for their hard work and dedication and to Cassie Clare for her incredible book series. We look forward to the final chapter of this breakthrough drama," read the statement.

The second half of the show's third and final season is slated to premiere in spring 2019.

The show features Katherine McNamara, Dominic Sherwood, Alberto Rosende, Matthew Daddario, Emeraude Toubia, Isaiah Mustafa, Harry Shum Jr and Alisha Wainwright.