Howard County police said they are investigating two unrelated homicides, the Thursday fatal stabbing of a teenager and the April death of a toddler.

Xavier Trevon Bates, 18, of Columbia, faces murder and assault charges in the stabbing death of a fellow teen in Long Reach, police said. Officers found Christian Lendell Hall, 17, suffering from stab wounds in the apartment where he lives in 8700 block of Airybrink Lane around 10 p.m. Thursday, police said. He was transported to the hospital, where he died.

Police said they believe Bates and Hall got into a fight earlier in the day. The dispute was personal, not gang or drug-related, police said. Bates came to Hall’s apartment Thursday night to fight him again, forced his way in, and then stabbed Hall multiple times, police said. Bates then fled on his bicycle.

When he got home, Bates was driven to the hospital for the treatment of a hand injury. Police arrested Bates there and he was taken to the Howard County Detention Center, where he is awaiting a bond hearing, police said.

In the earlier case, the Office of the Chief Medical Examiner in Howard County has ruled the April death of a 3-year-old in Columbia a homicide. Officers responded to the 9600 block of Basket Ring Road on April 13 at around 4 a.m. for a report of a child not breathing, police said. The call came from a parent.

Elijah Izeal LaJeuness, who lived in the home, was taken to Howard County General Hospital, where he was pronounced dead, police said.

There were no obvious signs of foul play at the scene, but detectives began investigating the case as possibly suspicious, police said. An initial examination of LaJeuness’s body did not determine the cause of death. After additional medical testing, the case was officially ruled a homicide, although police did not release what the medical testing found.