A member of a notorious gang that escaped from a Texas prison is scheduled for execution this week for killing a suburban Dallas police officer as the seven fugitives held up a sporting good store more than 14 years ago.

Donald Newbury on Wednesday evening would be the third member of the "Texas 7" to be executed since they were hunted down in Colorado six weeks after pulling off the largest prison escape in Texas.

The gang broke out of the Connally Unit in South Texas in December 2000.

Attorneys for the 52-year-old Newbury have asked the U.S. Supreme Court to put off his lethal injection.

A 29-year-old Irving police officer, Aubrey Hawkins, was gunned down as the gang robbed the store late on Christmas Eve in 2000.