Fiona Spargo-Mabbs gave her son a kiss and a hug, and told him she loved him. Daniel responded by saying "I promise I won't die" before leaving the house and heading to a rave where he collapsed.
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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.