13 year-old Casey Kearney died on Valentines' Day after she was stabbed in Elmfield Park in Doncaster.
Police want people who were seen near the park just after 1pm that day to contact them.
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Kenneth Wilson, 49, is wanted in connection with numerous offences including stalking and harassment committed in July against one woman.
Mrs Maguire, a schoolteacher in Leeds, was stabbed seven times by pupil Will Cornick in April 2014, and died in hospital later.
Motorists are being asked to avoid areas of Craven due to heavy flooding.