BANGKOK—Police in Thailand said Friday they have charged a U.S. citizen from the state of Colorado with murdering his pregnant Thai wife. Jason Matthew Balzer, 32, was interrogated Friday in the northern city of Nan where he had lived with Pitchaporn Kidchob, said police Lt. Col. Somkiat Ruam-ngern. The murder charge carries a maximum penalty of death. Balzer was arrested Thursday in the northern city of Chiang Mai and confessed to killing his 32-year-old wife, said Maj. Gen. Weerachon Boontawee, chief of Provincial Police Region 5′s Detective Department. It was unclear if Balzer had a lawyer representing him. Balzer’s last known residence in the United States was in Longmont, Colorado. According to Weerachon, Balzer said Pitchaporn had “given him hope,” so he married her and bought her a house in Nan, her home province. Balzer said he became enraged when she tried to chase him out, so he stabbed her …