Update with information from KBI 2:30 p.m.

Efren Lloyd Mascarenas, called a person of interest in a double homicide in Graham County, was found dead Thursday night in northeast Graham County, according to the Kansas Bureau of Investigation,

The KBI and Graham County Sheriff's Office is investigating the murders of two people in rural Graham County. The names of the victims had not been released as of Friday afternoon, pending positive identification and notification to next of kin, the KBI said.

First responders found a Hispanic male and white female deceased at 2756 170th Ave. near Penokee, after a 911 call was made to the Graham County Sheriff's Office at about 3:30 p.m. Thursday.

Mascarenas was identified as a person of interest and a search conducted throughout the night. The sheriff's office was assisted in the search by the KBI, Kansas Highway Patrol, Hill City Police, sheriff's offices from Rooks, Ellis, Phillips and Norton counties, and Hays Police Department.

No other details were released.

Update 9:45 a.m.

The attempt-to-locate advisory for Mascarenas by law enforcement has been canceled. The person of interest has been located.

Update 7:10 a.m.

By The Hays Daily News

HILL CITY — Authorities continue the search today for a man called a person of interest in a double homicide in Graham County.

Law enforcement officials are looking for Efren Lloyd Mascarenas, 29, who is described as 5 feet, 2 inches tall and weighing 130 pounds with brown eyes and black hair. He is believed to be armed and dangerous.

The homicides were discovered Thursday afternoon after a Graham County dispatcher received a 911 call about an unresponsive male in a rural area of the county, according to a release from the Graham County Sheriff’s Office.

When EMS and officers arrived, it was apparent a double homicide had occurred, the release said. The sheriff’s office, Hill City Police and Kansas Bureau of Investigation began the investigation.

The names of the victims have not yet been released.

A vehicle Mascarenas was known to be driving, a blue 2005 Dodge Charger, was found early in the evening.

Law enforcement personnel established a search perimeter around the area where the vehicle was located Thursday evening in a ditch on a road in the rural Graham County.

Residents in northeast Graham, southeast Norton, southwest Phillips and northwest Rooks counties were advised to secure their property and remain inside.

Through the evening and into early Friday morning, with temperatures dropping into the low 20s, personnel from the Rooks and Graham county sheriffs officers were joined by law enforcement from seven different agencies, including the Graham, Phillips, Norton and Ellis County sheriff’s offices, Hill City and Hays police departments and KBI.

Through the night into the early hours of Friday, officers on foot searched with night vision equipment and K9 units, at times entering buildings on farmsteads. Air patrols from the KHP searched over areas that ranged from near Bogue in Graham County to Logan in Phillips County.

Mascarenas, who also has an alias of Efren Lloyd Mascarenas Jr., according to the Kansas Department of Corrections, has been in and out of state prisons in the past.

He has three convictions in Ellis County — two for aggravated battery — and one in Trego County for aggravated battery. The convictions in Ellis County date back to 2010.

Mascarenas has spent time in correctional facilities in El Dorado and Lansing, and had been issued numerous disciplinary reports at the two facilities — including battery, fighting, dangerous contraband and assault.

This is still a developing story. Further updates will be posted as information becomes available.

Update 10:30 p.m. from Phillips County Sheriff's Office

A manhunt for at-large murder suspect Efren Lloyd Mascarenas continued in northeastern Graham County as of 9:30 p.m. Thursday. 

Officers were urging residents in northeast Graham, southeast Norton, southwest Phillips and northwest Rooks counties to secure their property and remain inside.

Residents are asked to immediately report any suspicious activity by calling 911. The public should not attempt to approach suspicious subjects, the Phillips County Sheriff's office said in a statement.

Update 7:10 p.m. from Decatur County Sheriff's Office

The Decatur County Sheriff’s Office identified a suspect as Efren Lloyd Mascarenas and described him as 5 feet, 2 inches tall and weighing 130 pounds with brown eyes and black hair.

He was last known to be driving a blue 2005 Dodge Charger with a broken passenger side mirror.

He is believed to be armed and dangerous.

HILL CITY — The Graham County Sheriff’s Office is investigating an apparent double homicide, according to a release from the sheriff.

At about 3:30 p.m., Graham County 911 received a call about an unresponsive male in rural Graham County. When EMS and officers arrived, it was apparent that a double homicide has occurred, according to the release.

Officers with the Graham County Sheriff’s Office, Hill City Police Department, the Kansas Bureau of Investigation and other agencies are investigating at this time.

No other information is being released at this time, according to the sheriff’s department.