There are no immediate reports of damage after four earthquakes rattled central Oklahoma overnight.
The U.S. Geological Survey reports that an earthquake and a series of aftershocks began about 1:45 a.m. Central Time with a magnitude 3.0 quake centered about 3 miles west-southwest of Chandler, Oklahoma.
That was followed a few minutes later by a magnitude 4.3 quake near Oklahoma City. US Geological Service puts the epicenter of the quake 7 miles east-northeast of Luther, Oklahoma, and about 29 miles east-northeast of Oklahoma City.
At 2:15 a.m. the ground shook again. This time a 2.8 magnitude quake struck about 54 miles east of the capital, followed a minute later by a 3.3 magnitude temblor about 4 miles east of Luther.
Steven Ray Thacker is to be put to death at 6 p.m. Tuesday at the Oklahoma State Penitentiary in McAlester for the December 1999 killing of Laci Dawn Hill in Mayes County.
Thacker - who waived his clemency hearing - would be the first person executed in Oklahoma this year.
Prosecutors say Thacker killed Hill after answering a newspaper ad she and her husband had placed to sell a pool table - then later killed Forrest Boyd in Missouri and Ray Patterson in Tennessee in the 10 days following Hill's slaying.
Thacker also faces a death penalty for the Tennessee slaying and life in prison in Missouri.
Investigators believe Jackson was killed in the suspect's north city home, not far from where her body was found stuffed in the trunk of her own car. The paper reports that the suspect's current girlfriend lives in the apartment building where Jackson's baby was found.