A Manhattan grand jury has indicted hapless Harlem-born rapper “G-Dep for the 1993 murder that he inadvertently confessed to earlier this month.

The P-Diddy protégé has now gone from being a free man — once unsought in the cold-case shooting — to a no-bail defendant facing a maximum possible prison term of 25 years to life.

“He was making amends,” said G-Dep’s lawyer, Michael Alperstein, explaining his client’s confession to the fatal shooting.

Alperstein said the rapper’s admission was prompted by a 12-step narcotics program.

Last week, G-Dep — whose real name is Trevell Coleman — was catapulted to a fame that he never enjoyed in hip-hop after confessing to a cold-case shooting, only to be shocked to learn that his alleged victim had died.