Montgomery County Police released a sketch of a man they say attacked a female jogger on the Capital Crescent Trail.
Investigators say the attack happened late last month near Brookeway Drive around 7 p.m.
The suspect knocked the 21-year-old woman unconscious, dragged her into the woods and sexually assaulted her.
The woman eventually woke up and made her way back to the trail, where another jogger saw her and called police.
Earlier this year another female jogger was attacked and sexually assaulted on the Capital Crescent Trail.