Vincent Lopez, 23

Vincent Lopez, 23, was charged in August in the January slaying of Ezequiel Velasquez. A 15-year-old boy, Angel Mendez, was charged late Friday in the killing. (Cook County Sheriff's photo / December 2, 2013)

A 15-year-old boy is the second person charged in the killing of a teenager fatally beaten on New Year's Day on the Southwest Side, authorities said.

Angel Mendez, 15, has been charged as an adult with murder in the slaying of Ezequiel Velasquez, 17, who was beaten early on New Year's Day and died Jan. 9, according to sources. Chicago Police Department News Affairs Officer Daniel O'Brien said the 15-year-old, whose name the office would not confirm because he is a juvenile, was expected to appear in Cook County Weekend Bond Court this weekend.

Mendez, of the 4600 block of South Rockwell Street, is the second person charged in the killing of Velasquez. Mendez was 14 at the time of the fatal attack.

Vincent Lopez, 23, of the 5800 block of South Whipple Street, was charged with murder in August after being arrested in July on an unrelated burglary charge, court and police records show. Lopez is being held without bail on charges including murder, carjacking and arson, according to court records.

Velasquez, along with a 21-year-old woman, was in the 2900 block of West 40th Street in the Brighton Park neighborhood about 6 a.m. Jan. 1 when he stopped the Chrysler Sebring he was driving because a Chevrolet Suburban was blocking his path, police said at the time.

Velasquez got out of the car and was beaten with a bottle and had his head smashed against a parked car, police said at the time. The woman was ordered out of the car and the attackers drove off in the Sebring, using it to push the apparently disabled SUV.

The Sebring later was found burned in the 4200 block of South Campbell Avenue, a little less than a mile away from where the attack took place.

The Cook County medical examiner's office determined Velasquez died from blunt force trauma to the head in a homicide.

Lopez, the man already charged in Velasquez's slaying, was arrested in July on a burglary charge connected with the March 24, 2011 break-in at a home in the 5400 block of West 63rd Place, according to police and court records. He originally was ordered held in lieu of $80,000 bond in that case, but in August, he was ordered held without bail after he was charged with murder in Velasquez's slaying.

Mendez is expected to appear in bond court Sunday. Lopez is next scheduled to appear in court on Dec. 19 before Criminal Court Judge Neera Lall Walsh.

lford@tribune.com | Twitter: @ltaford