when does an inheritance by one spose become marital property

Inheritance becomes marital property when it is commingled with marital assets.  For example if one spouse inherits money and deposits that money in a joint account it becomes marital. Another example one spouse inherits money and invests that money in a jointly owned property, it becomes marital. However if a spouse inherits and keeps the inheritance separate and in their name only, then it is not considered marital.