Alexa, did he do it? Smart device could be witness in suspicious Florida death

• Sylvia Galva Crespo killed by spear to chest in own home
• Amazon Echo may hold evidence as husband charged

Calling the witness - Alexa. Police in Florida are investigating whether they have stumbled on a silent witness to a possible murder and are trying to get the truth from "her".

Sylvia Galva Crespo, 32, was killed by a spear to the chest at home in Hallandale Beach, Florida, north of Miami, in July, which her husband, Adam Crespo, 43, has portrayed as a mysterious accident.