Miami Police in the US state of Florida investigating the bizarre death of a woman during a domestic row have obtained audio from two Amazon Echo devices, hoping that the smart-speaker, Alexa, has recorded the dispute.

Silvia Galva, 32, was impaled by a spear-tipped bed post in a struggle with her boyfriend, Adam Reechard Crespo, at their Hallandale Beach home, 32 km north of Miami, the BBC reported.