Peter Reeve, the gunman who shot dead off-duty officer Pc Ian Dibell yesterday, has been found dead in a churchyard in Writtle, near Chelmsford.
The family of Pc Dibell called him a "hero" and said he had paid for his actions "in the most devastating way".
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The one-year-old Yorkshire Terrier was attacked and killed while being taken for a walk.
The lifeboat crew carried the pair into their boat and dropped them off back at Tower Bridge as people watched from the riverside.
The huge painting took two graffiti artists thousands of hours to complete in east London.