The man accused of murdering Ann Widdecombe has also been charged with a terror plot against Reform UK leader Nigel Farage.
Joshua Kerry, 28, is charged with one count of preparation of terrorist acts relating to alleged activity between 31 May 2024 and 8 July 2026, Counter Terrorism Policing said.
Reform UK spokeswoman and former Tory minister Ms Widdecombe, 78, died on July 8 after she was hit over the head with a hammer 21 times at her home in Haytor on Dartmoor, Devon, a court previously heard.
Kerry, of Byrley Road, Rotherham, South Yorkshire, is also accused of her murder.
Senior national coordinator for Counter Terrorism Policing (CTP), Deputy Assistant Commissioner Vicki Evans, said: “We have been running a hugely intensive and complex investigation for some time.
“The charge announced today is a result of the tireless work of investigators across the Counter Terrorism Policing network.
“This investigation has been led by a dedicated team of detectives, analysts, and forensic experts, working on multiple lines of enquiry, which has resulted in this very serious charge.”