A man convicted then cleared of murdering a British student in Italy almost five years ago has described his nightmare after her death in a new book.

Meredith Kercher, a 21-year-old from Leeds University, was found semi-naked with her throat cut in a house she shared with American student Amanda Knox in November 2007.

Knox and ex-boyfriend Raffaele Sollecito were convicted in 2009 of killing Miss Kercher, from Coulsdon, Surrey, but their convictions were overturned last year. Rudy Guede, a drug dealer from the Ivory Coast, was convicted of sexual assault and murder.

In his book, Honour Bound, Mr Sollecito maintains the couple's innocence but admits their sometimes bizarre behaviour gave police reason for suspicion.

Miss Knox shopped for underwear after the killing and turned cartwheels. While police investigated the crime scene, Mr Sollecito kissed and caressed her, and she sat in his lap.

Police found their behaviour "odd" and he acknowledged they had no "real alibi the night of November 1 except each other".