A San Jose woman’s Fitbit helped provide clues to police investigating her death, leading to the arrest of her 90-year-old stepfather this week.

Tony Aiello was arrested on suspicion of murdering 67-year-old Karen Navarra on Sept. 8.

Navarra’s Fitbit recorded a rapid rise in her heart rate before a sudden drop-off to nothing, helping San Jose police piece together clues to her death.

An autopsy found “multiple deep and intrusive wounds” to her head and facial area, likely inflicted by a small hatchet or ax.

Police said nearby cameras captured Aiello’s car at Navarra’s home on Sept. 8 at the same time her Fitbit showed her heartbeat rapidly falling.

It could not immediately be determined if Aiello has an attorney.

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