A 19-year-old man who was fatally stabbed in Wolverhampton has been named by police as Shawn Seesahai.
Emergency services were called to open land off Laburnum Road shortly before 20:30 GMT on Monday but the man died at the scene.
His family were being supported as investigations continued, West Midlands Police said.
The force has asked anyone who was in the area or driving nearby between 18:00 and 22:00 GMT to get in contact.
Det Ch Insp Dave Sanders said: "While our thoughts remain with Shawn's family, our focus is on identifying exactly what has happened and bringing those responsible before the courts.
"Inquiries are continuing and we're asking motorists who were in the area to take a look at their dashcam as it may hold images or details which could be vital to our investigation.
"And we'd urge anyone who has information, and hasn't yet spoken with us, to come forward."