CHICAGO (CBS) — Police are investigating after a series of shootings on the city’s South and West sides – two of which proved deadly.

The first incident happened around 6:40 p.m. in the Back of the Yards neighborhood. Authorities say Christopher Clark, 17, was crossing the street near 54th Street and Hoyne Avenue when he was shot multiple times,

Clark, of the 4800 block of South Seeley Avenue, was pronounced dead 7:26 p.m. at Stroger Hospital of Cook County, according to the Cook County Medical Examiner’s office said.

Clark apparently was shot in the chest. No motive was known Tuesday morning, and no one was in custody.

Around 9:30 p.m. Monday, a 22-year-old man was shot as he sat in a car, in the 200 block of North Lockwood Avenue in the South Austin neighborhood. Someone walked up and opened fire, police said.

The man was taken in stable condition to Mount Sinai Hospital, with a gunshot wound to the leg. No one was in custody Tuesday morning.

In a third incident, a man was shot and killed while standing on the sidewalk in the Roseland neighborhood.

The 19-year-old victim was shot around 2:40 a.m. as he stood with another man near 107th Street and Michigan Avenue, police said.

The victim suffered a gunshot wound to the head and was pronounced dead, police said. His identity was not available, and no one was in custody Tuesday morning.

The Sun-Times Media Wire contributed to this report.

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