Boston Police report a 23-year-old man was stabbed to death around 12:10 a.m. at 92 Sumner St.

Lester James, 24, of Dorchester, was arrested this afternoon on a charge of murder, police say. He is scheduled for arraignment tomorrow in Dorchester District Court.

The victim, not identified by police, is Dorchester's 18th murder victim this year, but the first in August.

Dorchester/Mattapan murders over the past year.