Three fatal shootings in Baltimore on Sunday bring May's homicide count to 43, making it the most violent month in more than 40 years.

Police say two men were fatally shot in the head about 1 a.m. About 11 a.m., a man was fatally shot in the back.

With 43 homicides, May is the deadliest month since the early 1970s, when 44 people were killed in December 1971 and 45 people in August 1972, according to the Baltimore Sun.

There have been 116 homicides in Baltimore in 2015. By this time last year, homicides hadn't hit triple digits. As homicides rose in May, the number of arrests plummeted. Some attribute the drop to increased scrutiny of police following the April death of Freddie Gray from injuries received in police custody.