PHILADELPHIA (CBS) — A West Philadelphia teenager is behind bars, charged with several armed robberies and a murder.

Seventeen-year-old Ma-King Stewart of Parkside Avenue near 51st Street, was arrested yesterday after an investigation by Philadelphia police.

READ MORE: Philadelphia Mayor Jim Kenney Says He'll Be Happy When He's Not Mayor Following Fourth Of July Shooting

Police: Teen Behind Several Gunpoint Robberies In Southwest Philly 

He is being charged as an adult.

READ MORE: Sources: Authorities Investigating Whether 2 Police Officers Struck By Stray Bullets On Ben Franklin Parkway

Police had been looking into a series of armed robberies in the Market Street Corridor between 60th and 62nd Streets. They all occurred between March 17th and March 31st.

One victim told police the suspect had taken his 40-caliber handgun, during a hold-up on March 26th.

Detectives say that same day, that gun was used in the murder of a 17-year-old boy on Larchwood Avenue near 59th Street.

MORE NEWS: Kyle Schwarber Homers Twice In Phillies' 11-0 Romp Past Nationals

Charges against Stewart include murder, robbery, and weapons violations.