CHICAGO — A man was charged with murder in Cook County after allegedly killing a pregnant woman and dumping her body in the north suburbs. Court documents allege Juan Vega Montoya bought beer after the murder and hid Megan Lewis’ body in his car for two days.

On Nov. 26, Vega Montoya was accused of picking up Lewis near Cicero and Belden in Chicago.

Prosecutors believe he strangled her to death during an argument in his car. He’s accused of buying beer directly after the murder. Back at his home, Vega Montoya allegedly put her body into the back of his sedan and placed a t-shirt over the driver’s window to conceal.

He later told police the next evening he drove north for about an hour “until the expressway turned into a roadway.”

The body of Lewis was found in garbage bags on the side of Hunt Club Road in Old Mill Creek on the morning of Nov. 29.

A DNA test was obtained after Vega Montoya was taken into custody on Dec. 11. Court documents state a fingernail and earring belonging to Lewis was found inside the car.

Lewis was 16 weeks pregnant at the time.

Detectives later learned that he allegedly texted his supervisor the day after the murder that he overslept and was running late.

Vega Montoya was initially charged in Lake County with concealment of a homicidal death. At the time, suburban police said additional charges were expected in Cook County.