The former Portuguese detective in the disappearance of Madeleine McCann plans to publish an "explosive" book on the case in which he asserts the British toddler is dead, among other claims, London's Daily Mail reported.

Goncalo Amaral, 48, has finished writing "True Lies," which he intends to publish once a judge lifts a gag order in the case.

Amaral left the police force Monday night after 28 years as an officer, according to the Mail. He said he quit the force to get back his "freedom of speech."

Amaral believes Madeleine, who was 4 when she vanished while on vacation in Portugal with her parents and twin younger siblings, won't be found alive.

Amaral was booted from the case after five months because he publicly criticized his British counterparts. He accused them of only following up on leads that Madeleine's parents, Kate and Gerry McCann, wanted investigated.

"I am not saying that the English police were under the command of the McCanns, but they were influenced," Amaral said. "In a way, we were all influenced by the campaign that they organized, according to which the girl was alive and had to be found."

Amaral was rumored to be the source who leaked many of the news stories that implicated the McCanns in their daughter's disappearance.

He also was frequently photographed drinking over lunch and dinner when he was involved in the case, according to the Mail.

Click here for more on this story from London's Daily Mail.