She was put on trial for the suspected murder of her husband.
Literal
She [topic-は] husband [object-を] killed suspicion [with-で] trial [to-に] was-put.
裁判にかけられた ('was put on trial') is the passive of 裁判にかける. 容疑で ('on suspicion of') uses the causal で. ころした uses hiragana for 殺す — a common avoidance of the stark kanji 殺.