The National Transportation Safety Board says a helicopter pilot was speaking with an air traffic controller when it crashed into a tower, killing all four people on board.

A helicopter crashed into a radio tower Sunday night in east Houston, killing several people — including a child — as it caught fire and plunged to the ground, authorities said. Four people were reportedly on board the Robinson R44 Raven II helicopter,

An attorney suggested the lawsuit is part of a broader fact-finding mission to determine how the crash occurred in the first place. This article, Family sues helicopter company, radio tower owner over Houston crash,