Alonzo Campos, Jr., 20, of unincorporated Round Lake.

A 48-year-old woman was killed Friday morning after a 20-year-old man allegedly entered her home, shot her with a BB gun and then stabbed her with a knife, police said.

Alonzo Campos, Jr., 20, of the 24500 block of West Passavant Avenue in unincorporated Round Lake, has been charged with two counts of first-degree murder in connection with the death of Mariana Castro-Tellez, 48, of Round Lake Beach.

The Round Lake Beach Police Department responded to a call of shots fired at 4:40 a.m. Friday in the 1500 block of Cherokee Drive. Police officers found Castro-Tellez dead inside the residence, Lake County Major Crime Task Force spokesman Christopher Covelli said.

Covelli said that Campos entered Castro-Tellez’s home and was armed with a BB gun. While inside the home, he confronted the woman and shot her several times with the BB gun before stabbing her with a knife.

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A family member heard the BB gun discharge, prompting the 911 call to Round Lake Beach police around 4:40 a.m. Friday. Campos fled the home and was taken into custody later that evening.

Covelli said that Campos knows a family member of Castro-Tellez. Police would not comment if there was a motive for the killing.

Lake County Coroner Dr. Howard Cooper said that an autopsy showed Castro-Tellez died from sharp force trauma. “We have been in contact with Ms. Castro-Tellez’s family and our sincerest condolences go out to them, during this painful time,” Cooper said.

The Lake County Major Crime Task Force was called to assist Round Lake Beach police in the investigation. Campos is scheduled to appear in court Tuesday.