The Long Island man who spent 17 hellish years in prison before his murder conviction was overturned last year has joined the fight to free an Arkansas jailbird whose case has exploded into a cause célébre.

Martin Tankleff is a consultant to a high-powered team of supporters, including Johnny Depp, battling to free Arkansas death-row inmate Damien Echols.

Echols, now 35, and two other men, then teens, were convicted of slaughtering three young boys in West Memphis, Ark., in 1993.

Supporters argue that the convictions were based on a coerced confession.

Tankleff, 38, convicted of murdering his parents in 1994 based on a dubious confession, has reached out to Echols’ wife and has worked to gather legal advocates and lawyers who worked on his own case to help the Arkansas man.

“I conveyed to her the importance of having a good legal team and good advocacy,” said Tankleff