HUNTSVILLE, Texas (AP) — A 41-year-old man convicted of killing three people during a robbery at their San Antonio home more than 21 years ago is set to become the first Texas inmate executed this year.

Arnold Prieto and two brothers related to two of the victims were arrested near Dallas seven months after the killings. Prieto was the only one of the three to get the death penalty.

The Supreme Court, most recently in 2009, declined to review Prieto's case after a series of lower court appeals.

Prieto faces lethal injection Wednesday evening in Huntsville for the slayings of 72-year-old Rodolfo Rodriguez, his 62-year-old wife, Virginia, and Paula Moran, their 90-year-old former nanny who lived with them.

Each was stabbed or cut as many as 31 times with an icepick, screwdriver or knife.