A Vancouver man is accused of attempting to stab a man he found in his bed with his girlfriend.Luis Armando Lopez-Montejo, 26, appeared Monday in Clark County Superior Court on suspicion of second-degree assault.Judge John Nichols held him on $50,000 bail and appointed Vancouver attorney Jeffrey Barrar to defend him against the charge. His arraignment is scheduled for Friday.According to a court affidavit, Lopez-Montejo returned home to find a man in bed with his girlfriend. Lopez-Montejo grabbed a 12-inch kitchen knife and told the man in Spanish: “I’m going to kill you,” according to the affidavit. He attempted to stab the man in the abdomen, but the man grabbed the knife’s blade, the affidavit says. After a struggle, the man seized control of the weapon from Lopez-Montejo, but he sustained a cut to his hand from the blade and a cut to his nose during the struggle, the affidavit says.Vancouver police responded to the residence in the 2100 block of Northeast Bridgecreek and found a large amount of blood on the bedroom floor, window, the victim and Lopez-Montejo’s girlfriend, according to the affidavit. Police said they found the blood-drenched knife in the kitchen sink. The date of the incident was not included in the court affidavit.Lopez-Montejo turned himself in to the Vancouver Police Department East Precinct early Saturday, according to the affidavit. He allegedly confessed to the crime beforehand in a phone conversation, the affidavit says.