Police officer deaths

Williams, 29, is believed to be armed and dangerous.

The suspect has a criminal past and was arrested in 2016 for allegedly strangling a pregnant woman and vandalizing her vehicle.

A GoFundMe drive for Zackari Parrish, the officer killed in a Colorado shooting on Sunday, has raised more than $160,000.

The number gunfire deaths among police officers is down in 2017, a 34 percent decline from last year's unusually high numbers.