I’m not thrilled with the line, “…a father tries to explain his actions leading up to the tragedy”

In the words of Yoda, “do or do not, there is no try.”
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“Responsible for the death of his son, a father recounts his actions leading to the tragedy before taking his own life.”
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Since the logline is short enough, I would consider adding who he’s recounting the events too and for what purpose. (Unless that spoils the ending)

Hope that helps. Good luck!

Because of how short a logline is, it’s important to write it from the prospective of lead character.
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“After his best friend is sent to death row, a scrappy newspaper reporter has one week to discover the true killer before his childhood friend is executed.”
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One minor thing, The court wouldn’t sentence someone acquitted of murder to death row. So telling us he was found guilty of murder isn’t needed in the logline, just that he’s on death row.