A man accused of murder in California appears to have sought a marriage license with a woman charged in connection with the fatal shooting of a U.S. Border Patrol agent in Vermont.

The woman, Teresa Youngblut, 21, of Washington state, faces two weapons charges in connection with the Jan. 20 death of 44-year-old Border Patrol Agent David Maland.

A prosecution motion seeking Youngblut’s detention Monday says she was in frequent contact with someone who is a person of interest in a homicide investigation in Vallejo, California.

Court records show that Maximilian Snyder, 22, was arrested by Vallejo police on Friday. He was charged Monday with murder and has a court appearance scheduled Tuesday in California’s Solano County. An attorney was not listed for Snyder.

In November, individuals identified as Teresa Youngblut and Maximilian Snyder took out a marriage license, according to a records search in Washington state’s King County.

The U.S. attorney’s office in Vermont was asked if Snyder was the person of interest in the California case.

“As a general policy, the U.S. Attorney’s Office for the District of Vermont does not comment on ongoing cases beyond the public record,” spokesperson Fabienne Boisvert-DeFazio responded in an email Tuesday.

A message seeking comment was left with the FBI.

In Vermont, Youngblut had been traveling with Felix Bauckholt, a German citizen who also was killed in the Jan. 20 shooting. It’s unclear when they arrived in Vermont, but the FBI said the pair had been under surveillance there for several days.

Before that, Bauckholt and Youngblut had been renting units in separate duplexes in the same neighborhood in Chapel Hill, North Carolina, according to the owner of the buildings, who asked not to be identified because he fears for his safety and that of his other renters.