The Latest on Missouri's planned execution of inmate Marcellus Williams (all times local):

1:50 p.m.

Missouri Gov. Eric Greitens halts condemned killer's scheduled execution after DNA raises questions about his guilt.

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10:40 a.m.

Death penalty opponents are protesting Missouri's planned execution of an inmate who maintains his innocence.

Missourians for Alternatives to the Death Penalty and other groups are organizing rallies and vigils throughout the state ahead of the scheduled 6 p.m. Tuesday execution of Marcellus Williams.

One will take place outside of the Capitol office of Republican Gov. Eric Greitens, whom Williams has asked for clemency.

Williams was sentenced to death in the 1998 fatal stabbing of Lisha Gayle, a former St. Louis Post-Dispatch reporter who left journalism for social work. Authorities say she surprised Williams while he was robbing her home in the St. Louis suburb of University City.

Williams' attorneys contend that testing conducted in December using techniques that weren't available at the time of the killing showed that DNA found on the knife matches an unknown man, but not Williams.

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12:05 a.m.

Missouri is preparing for its second execution of 2017, even as condemned inmate Marcellus Williams continues to declare his innocence.

Williams is scheduled to die by lethal injection at 6 p.m. Tuesday at the state prison in Bonne Terre for the 1998 stabbing death of Lisha Gayle. The onetime St. Louis Post-Dispatch reporter surprised the burglar and was killed at her University City home.

Attorneys for Williams contend that testing conducted in December using techniques that were not available at the time of the killing showed DNA found on the knife matches an unknown man, but not Williams. They say previous DNA testing of hairs from Gayle's shirt and fingernails also excluded Williams, and that footprints at the scene did not match Williams.