Ross and Clare Simons had been married for about 18-months when they were killed after a man knocked them off their tandem bike in January in Bristol.
Nicholas Lovell, 38, will be sentenced in four weeks after pleading guilty to causing the deaths by dangerous driving of the couple.
Mr Lovell's partner Louise Cox has pleaded guilty to perverting the course of justice.
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The flame-haired royal is an accomplished polo player but that didn't stop him taking a tumble not once, but twice, during the game.
A 24-year-old man has been arrested on suspicion of murder after the body washed up on the Thames shoreline.
Police were called to an address in Carlisle on Friday night but the eight-month-old died later in hospital.