Metro

Arrest in ’09 slay

A convicted drug dealer has been busted in the murder of an Idaho man who had moved to Brooklyn dreaming of making it big in the music scene, officials said yesterday.

Tyshawn Augustus, a violent crack dealer, allegedly shot guitarist Troy Young, 29, on Dec. 11, 2009, during a robbery in the victim’s Carroll Gardens apartment.

He was charged days after he completed a two-year stint in a federal prison on drug charges.

In the weeks after Young’s murder, cops had suspected Augustus, who overheard Young talking in a bar about a possible record deal, and who then allegedly asked around the neighborhood for a partner in his planned robbery.

They never had enough evidence to charge him, but in a raid at his late grandmother’s apartment, cops found crack, pot and a loaded .357 revolver, authorities said.

The NYPD turned him over to the feds and he served two years.

While he was in prison, cops matched Augustus’ DNA to samples found under Young’s fingernails.

“When . . . this guy goes away for life, it’s never going to bring Troy back, but if there is such a thing as justice for an act like that, I can say it’s partially been served,” the victim’s father, Ed Young, told The Post.