BBC NEWS | 8/19/2009 12:00:00 AM
Colombia arrests ex-security head
Aug 19--Colombian authorities have arrested a former head of the secret police - the Das - in connection with a high-profile unsolved murder.
The murder is believed to have been ordered by Medellin drugs cartel boss Pablo Escobar, but 20 years later still has not been properly solved.
Mr Galan was shot dead as he addressed a rally in Bogota in August 1989.
He was the favourite to win the presidential elections.
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