Magnus Bane (Harry Shum Jr) and Alec Lightwood ( Matthew Daddario) in ‘Shadowhunters.’ (Screenshot via YouTube)

Freeform has announced its supernatural series “Shadowhunters” will end after its third season.

“Shadowhunters,” based on “The Mortal Instruments” book series by Cassandra Clare, stars  Katherine McNamara, Dominic Sherwood, Matthew Daddario and Emeraude Toubia as part human/part angels who must protect people from demons and maintain order in the Shadow World.

Daddario plays Alec Lightwood, a closeted Shadowhunter who falls for Warlock Magnus Bane (Harry Shum Jr).

“It has been an absolutely wonderful experience getting to be part of Shadowhunters for the past three years. After all of it, I hope I have fulfilled my promise of being the best Alec Lightwood you could ask for. Look out for the great work this crew will be doing out of,” Daddario wrote in a tweet.

It has been an absolutely wonderful experience getting to be part of Shadowhunters for the past three years. After all of it, I hope I have fulfilled my promise of being the best Alec Lightwood you could ask for. Look out for the great work this crew will be doing out of

— Matthew Daddario (@MatthewDaddario) June 5, 2018

“We are very proud of Shadowhunters, a series that broke new ground in the genre world and became a fan favorite,” the network said in a statement to People. “However, along with our partners at Constantin, 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 twelve 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.”

The second half of the third season premieres in 2019 with a two-episode series finale.