Police have not yet confirmed the sex of the baby but said a post mortem examination is expected to take place on Monday.
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Alexander Krushelnitsky is widely reported to have tested positive for meldonium, a drug which increases blood flow.
An investigation into the alleged Oxfam sex scandal was launched following a tip-off.
From March 1, the paper £10 note will cease to be legal tender - replaced completely by the polymer version.