Jenna Wall

The children heard the gunfire, but didn't see the fatal encounter that left their mother dead, police said.

Hundreds of framed patents hang on two separate walls at the headquarters of Motorola Mobility in Libertyville, Illinois. They testify to the pride in innovation at Motorola, a luminary of American business that has survived corporate crises and enormous technological change.

Hundreds of framed patents hang on two separate walls at the headquarters of Motorola Mobility in Libertyville, Illinois. They testify to the pride in innovation at Motorola, a luminary of American business that has survived corporate crises and enormous technological change.

The children heard the gunfire, but didn't see the fatal encounter that left their mother dead, police said.

Hundreds of framed patents hang on two separate walls at the headquarters of Motorola Mobility in Libertyville, Illinois. They testify to the pride in innovation at Motorola, a luminary of American business that has survived corporate crises and enormous technological change.

Hundreds of framed patents hang on two separate walls at the headquarters of Motorola Mobility in Libertyville, Illinois. They testify to the pride in innovation at Motorola, a luminary of American business that has survived corporate crises and enormous technological change.