Gaspar: Where did Martha go?
Skakel: I saw her leave the back door and walk around to our here. I assume she went out here. That was the direction she was going.
I think it is fairly plain to see that Julie was under the impression that when Tommy tells [^] last saw Martha by "the back door" he means by the side door of the house at 9:30. When Julie went into his room at 1:30 am, Tommy was, for some reason, purposefully deceitful.
Now, let's assume, for a moment, that even though Tommy was purposefully deceitful, he still didn't know anything about Martha's murder. In the upcoming interview, Tommy may take the following defensive stance: Look, it was only 1:30 in the morning. That's not really late. I wasn't worried. Lot's [lots] of parties were going on...Martha even told me that she might sneak out of her house. I wasn't trying to lie to Julie, I just was too tired to explain everything that had happened. That's all. I was sure it was all no big deal.
Again, this is a reasonable explanation--on the surface. When we delve deeper, however, Tommy still has some explaining to do.
For instance, what about the next call from Mrs. Moxley, which according to Julie, came at around 4:00 am. Julie repeated the routine, and Tommy stuck to his story. There is some evidence suggesting that Tommy actually, at one point, got on the phone with Mrs. Moxley himself.
Indisputably, there is a serious difference between a fifteen year-old Martha being out at 1:30 am and, now, 4:00 am. Tommy can contend that he was not concerned at 1:30, but how can he stick to a stance of nonchalance at 4:00 am? Wouldn't Tommy, by now, show a little decency and concern? At this point, what harm would be done by at least admitting the last time he saw Martha and how she ran across the lawn to her own house. Why didn't Tommy join his sister Julie in the search for Martha?
Perhaps, Tommy knew there was no point in searching for Martha. Maybe, he already knew what they would find.
The simple question: Why was Tommy lying to Julie at 1:30 am unless he already knew there was a reason to cover up his true actions?
On this point, if Tommy is again questioned in the aforementioned supportive/confrontational manner, I believe he will be forced to reveal more.
There is evidence, however, to suggest that Julie (and, thus, possibly Tommy) were aware that Martha was missing significantly earlier than 1:30 am. According to Andrea Shakespeare Renna,