Linda Lee Hamm had been driving erratically when she drove onto a curb and over a median and then struck and killed a pedestrian last month in Maple Grove, Hennepin County prosecutors say in a criminal complaint charging her with criminal vehicular homicide.

Hamm, 61, of Maple Grove turned herself in to the Hennepin County jail on Tuesday and posted a $150,000 bond.

On Jan. 31, Maple Grove police received a report of a car moving erratically, according to the criminal complaint. A police officer pulled in behind the suspect vehicle as it approached Hemlock Lane.

Just then, the car went over the curb and struck Ann Blake, 54, who had been standing on the sidewalk, according to the complaint. The car continued across the center median on Hemlock Lane and crashed into another vehicle.

Blake, of Andover, died at the scene, the complaint said.

Hamm allegedly had watery, glassy eyes and appeared confused. The police officer following her found an open vodka bottle in Hamm's car, the complaint said.

At the hospital, where Hamm was taken for her injuries, the officer interviewed her and obtained a breath sample, which registered a blood-alcohol level of 0.169 - more than twice the 0.08 legal driving limit.

A blood sample tested at the Bureau of Criminal Apprehension indicated a blood-alcohol concentration of 0.18.

Blake's sister, identified as J.G. in the complaint, told police that she and Blake were waiting for the walk signal so they could cross

Neither saw the car coming, she told police. They didn't hear screeching tires, either.

According to the Osseo School District, Hamm began working for Osseo Area Schools in 1972 as a speech therapist. At the time of the crash, she was working as a part-time teacher, serving as an early-childhood program assistant, WCCO reported.

Brady Gervais can be reached at 651-228-5513. Follow her at twitter.com/bgervais.