Police say a 16-year-old girl is dead and her mother was hurt in an attack in their Ellicott City home, just west of Baltimore.
Officers say the alleged 15-year-old gunman is in critical condition after shooting himself in the head.
The Howard County Police Department said in a news release that 52-year-old Suzanne Zaremba heard a scuffle in her daughter's bedroom about 2 a.m. Sunday.
Investigators say Zaremba went to Charlotte Zaremba's bedroom and saw a man. Police say he shot Suzanne and Charlotte Zaremba, then himself.
Charlotte Zaremba died at a local hospital; Suzanne Zaremba was treated and released.
Police say the alleged gunman is being treated for life-threatening injuries at Shock Trauma in Baltimore. Authorities say it is not clear if he has any connection to the victims.
This content appears as provided to The Globe by the originating wire service. It has not been edited by Globe staff.