Police: Links sought between 4 victims, man in US illegally

This undated photo provided by the Carson City Sheriff's Office in Carson City, Nev., shows suspect Wilbur Martinez-Guzman. Authorities investigating four recent Nevada killings say murder charges are pending against Martinez-Guzman, suspected of being in the U.S. illegally. (Carson City Sheriff's Office via AP)
This undated photo provided by the Carson City Sheriff's Office in Carson City, Nev., shows suspect Wilbur Martinez-Guzman. Authorities investigating four recent Nevada killings say murder charges are pending against Martinez-Guzman, suspected of being in the U.S. illegally. (Carson City Sheriff's Office via AP)
This undated photo provided by the Carson City Sheriff's Office in Carson City, Nev., shows suspect Wilbur Martinez-Guzman. Authorities investigating four recent Nevada killings say murder charges are pending against Martinez-Guzman, suspected of being in the U.S. illegally. (Carson City Sheriff's Office via AP)
This undated photo provided by the Carson City Sheriff's Office in Carson City, Nev., shows suspect Wilbur Martinez-Guzman. Authorities investigating four recent Nevada killings say murder charges are pending against Martinez-Guzman, suspected of being in the U.S. illegally. (Carson City Sheriff's Office via AP)
This January 2019 photo shows a copy of the 2006 Reno Rodeo program with a photo of Gerald David. A man suspected of being in the U.S. illegally shot and killed several people in Nevada over the past few weeks, including David and his wife, authorities said, and the slayings added fuel to the immigration debate. On Jan. 16, 2019, the bodies of 81-year-old Gerald David, and his 80-year-old wife, Sharon, were found in their home on the southern edge of Reno. (Reno Gazette Journal via AP)
This January 2019 photo shows a copy of the 2006 Reno Rodeo program with a photo of Gerald David. A man suspected of being in the U.S. illegally shot and killed several people in Nevada over the past few weeks, including David and his wife, authorities said, and the slayings added fuel to the immigration debate. On Jan. 16, 2019, the bodies of 81-year-old Gerald David, and his 80-year-old wife, Sharon, were found in their home on the southern edge of Reno. (Reno Gazette Journal via AP)
A neighborhood watch sign is seen Wednesday, Jan. 23, 2019, near the Gardnerville Ranchos, Nev., home of Connie Koontz, the first of two women in the community who were found dead in their homes. The killings of the two women and a couple north in Reno that police say were committed by a man in the U.S. illegally have put the community on edge. (AP Photo/Michelle L. Price)
A neighborhood watch sign is seen Wednesday, Jan. 23, 2019, near the Gardnerville Ranchos, Nev., home of Connie Koontz, the first of two women in the community who were found dead in their homes. The killings of the two women and a couple north in Reno that police say were committed by a man in the U.S. illegally have put the community on edge. (AP Photo/Michelle L. Price)
A welcome sign sits at the entrance to the tight tight-knit community of Gardnerville Ranchos, Nev., Wednesday, Jan. 23, 2019, where two women were recently found dead in their homes. The killings of the two women and a couple up north in Reno that police say were committed by a man in the U.S. illegally have put the community on edge. (AP Photo/Michelle L. Price)
A welcome sign sits at the entrance to the tight tight-knit community of Gardnerville Ranchos, Nev., Wednesday, Jan. 23, 2019, where two women were recently found dead in their homes. The killings of the two women and a couple up north in Reno that police say were committed by a man in the U.S. illegally have put the community on edge. (AP Photo/Michelle L. Price)