Detectives probing the matter reportedly picked inconsistencies with his account of how the Keroche Breweries director of strategy and innovation met her death.
Lali, who has been living at Shela in Lamu with Ms. Muigai since April, initially said she tumbled down the stairs before later changing his account to say she tripped in the bathroom.
None of the versions of events were however consistent with the accounts given by responders who took Ms. Muigai to hospital.
There were reports that the couple had an argument before the fatal incident although Lali’s lawyers rejected the reports.
Tecra was picked by a helicopter chartered by her family and flown to Nairobi for treatment where she succumbed to her injuries.
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