Federal agents have arrested a woman in Colorado on a charge linked to the murder of a man who was gunned down in the parking lot of a community center in Oglala Lakota County, S.D., last month, according court records.

Tiffanee “Love” Garnier was arrested earlier this week on a federal charge of “having knowledge of … the fatal shooting of Vincent Brewer III,” according to a grand jury indictment filed Nov. 16 in Denver U.S. District Court.

Brewer, 29, was the fourth person to be murdered in a string of shootings on the Pine Ridge Reservation over a four-month span between July and October, according to Rapid City, S.D., news reports. Brewer was fatally shot on the afternoon of Oct. 16 in a parking lot outside a community center where he had just played in a basketball tournament, the Rapid City Journal has reported.

FBI and Bureau of Indian Affairs agents are investigating whether Brewer’s murder was linked in some fashion to at least one other recent murder on the South Dakota reservation, according to a news release.

Orlando Guadalupe Jose Ephron Villanueva de Macias was arrested in Colorado on Oct. 3 and is currently being held in a Denver-area jail on second-degree murder charges. He allegedly fatally shot Chunta Suta Wi Colhoff, 34, on Sept. 29, according to federal charging documents.

Villanueva de Macias couldn’t have pulled the trigger in Brewer’s shooting because he was in custody at the time.

Charging documents say Garnier concealed information about who killed Brewer and assisted the assailants in fleeing the scene. She did not notify civil authorities as soon as possible of what she knew, according to the three-page charging records.

The Rapid City Journal also reported that two other people were murdered on the reservation last summer. In July, 13-year-old Te’ca Clifford was killed while walking home with her friends in Pine Ridge, the Journal reported. Todd Little Bull was fatally shot in August. The paper quoted Oglala Sioux Tribal president John Yellow Bird Steele as saying that all four cases were likely related to drugs.

Villanueva de Macias awaits extradition proceedings, said Jeff Dorschner, spokesman for acting U.S. Attorney Bob Troyer. The convicted crack dealer was released 20 months early from a federal prison in Colorado after passage of the federal Fair Sentencing Act. He fled a supervised-release program and hid out in the Pine Ridge Reservation, where he allegedly killed Colhoff.

If he hadn’t been released early from prison, Villanueva de Macias would have still been in prison when Colhoff was fatally shot, according to authorities.

The arrest warrant affidavit in Villanueva de Macias’ case, which is filed in U.S. District Court in South Dakota, is sealed.