Police arrested a suspect for the woman’s death.
“We can confirm the death of an American citizen, Catherine Serou, in Russia,” the US embassy in Moscow told CNN in a statement.
The embassy added, “We offer our deepest condolences to the family for their loss. We are closely monitoring the local authorities’ investigation into the cause of death. We are providing all appropriate assistance to the family.”
Serou, 34, was a student at Nizhny Novgorod State University, east of Moscow.
An investigation has been opened into his death, the regional Home Office confirmed to CNN.
The Russian investigative committee (Sledcom) said in a statement on Saturday that the body of a “foreign citizen missing in the Nizhny Novgorod region” had been found. The statement did not name Serou.
The student was last heard from on June 15 according to his mother, who was quoted in the statement on the committee’s website.
The committee said Serou left his home “at about 6.30 p.m. Moscow time on June 15 … entered a vehicle not identified by the investigation and drove to the village of Rekshino, Borsky district, Nizhny Novgorod. “
The committee added that Serou last had telephone contact with her mother, when she said she was “traveling in a car with [an] unknown person.”
“Unfortunately, we received a call from the police this morning telling us that they had found his body. As our family deals with this news, we will have more to say.”
A resident of the Nizhny Novgorod region is in custody on suspicion of murder, Sledcom said.
The suspect, born in 1977, has been convicted “on several occasions” for “particularly serious crimes,” the committee said. The person is cooperating with the investigation.
A decision on whether to bring charges against him is expected soon, the statement added.