US to execute three death row inmates this week

Matthew Johnson, 49, is to die by lethal injection at the Texas State Penitentiary for the 2012 murder of Nancy Harris, a 76-year-old grandmother.

Johnson admitted at trial to pouring lighter fluid on Harris and setting her alight during an early morning robbery of a store in Garland, Texas.

Harris suffered severe burns and was taken off life support five days later.

Johnson's execution is one of two scheduled for Tuesday.

Benjamin Ritchie, 45, is to be put to death by lethal injection in Indiana for the 2000 murder of a police officer, Bill Toney, in the second execution in the midwestern state since 2009.

Toney, a father of two, was shot to death after pursuing a van that had been stolen by Ritchie and another man from a gas station in the town of Beech Grove.

Ritchie is to be executed some time between midnight Central Time (0500 GMT) and sunrise at the Indiana State Prison in Michigan City.

The other execution scheduled this week is in the southern state of Tennessee.

Oscar Smith, 75, is to be put to death by lethal injection on Thursday for the 1989 shooting and stabbing murders of his estranged wife, Judy Smith, and her two sons, Chad and Jason Burnett.

There have been 16 executions in the United States this year: 12 by lethal injection, two by firing squad and two using nitrogen gas.

The death penalty has been abolished in 23 of the 50 US states, while three others -- California, Oregon and Pennsylvania -- have moratoriums in place.

President Donald Trump is a proponent of capital punishment and called on his first day in office for an expansion of its use "for the vilest crimes."