An 18-year-old Baton Rouge man is awaiting sentencing on Sept. 30 following his conviction in the 2009 slaying of a 57-year-old man and robbery of another man at the Brandywine Condominiums.

Tevin Crockett, who was 15 at the time of the incident, was found guilty Thursday of second-degree murder and armed robbery.

Second-degree murder carries an automatic sentence of life in prison. Armed robbery is punishable by up to 99 years.

Crockett was convicted in the shooting death of Theodore Lange on April 24, 2009.

Prosecutor Tracey Barbera told the East Baton Rouge Parish jury that Lange was shot during an apparent drug deal.

Even though Crockett was 15 at the time, Barbera described him as a man.

“It doesn’t matter how old you are. Once you put a gun in your hand, you’re a man,’’ she told jurors. “That is a rite of passage. Welcome to adulthood.’’

Crockett’s attorney, Hays Town III, argued his client was an adolescent at the time of the incident, not a man.

Rondale Simpson, 18, also is charged with second-degree murder and armed robbery in the case. He is scheduled to appear before state District Judge Richard Anderson on Sept. 22 for a status hearing.

Barbera argued that Crockett and Simpson, who lived at the Brandywine complex on Darryl Drive, were looking for a quick “payday.’’

“Ted Lange paid the ultimate price’’ for trying to buy drugs, she said.

Barbera urged the jury to make Crockett pay for what he did, asking them to “cash the check of justice.’’

Barbera and Town noted that another man known only as “Pookie’’ was allegedly with Crockett and Simpson at the time of the incident.

“You can’t send someone to jail if you happen to be at the wrong place at the wrong time,’’ Town said of Crockett.